Added synchronization to AbstractSubmitter.
Added more sync points to GridCubeProximitySorter.
Disabled unnecessary code in Tunnel.
Moved start position override from Game to Mission. (it works again)
Updated Camera to report position to debug vars correctly instead of the
toString() value of an array.
Added sync of game state lock in CollisionManager when performing
collision tests and behavior calls.
Adjusted sync points in WorldObject.notifyPositionChanged() to avoid
rare possibly-disappearing objects.